Before setting up or modifying your custom domain with your DNS provider, you should add or remove the custom domain on GitHub.
For more information, see "Quick start: Setting up a custom domain."
- On GitHub, navigate to your GitHub Pages site's repository.
Under your repository name, click Settings.
Under "Custom domain," add or remove your custom domain and click Save. To check if your custom domain is supported, see "About supported custom domains."
- If you added a custom domain you can optionally enforce HTTPS for your site. For more information, see "Securing your GitHub Pages site with HTTPS."